Patent GB-454869-A (GB)
Title: Dyeing and printing of textile materials and dye-preparations therefor
IPC: C09B67/36
Filed: 1935-04-08
Abstract: Textile materials are dyed or printed by applying to the material a composition comprising a water-soluble diazoimino compound (derived from a diazo component free from solubilizing groups and a secondary amine), a suitable ice-colour coupling component, and a developing agent (i.e. a water-soluble compound capable of generating acid during the subsequent steaming or heating operation), together, if desired, with a wetting agent or solvent, alkaline - reacting substance, and thickening agent, and thereafter applying heat and moisture, e.g. by steaming.  Vat dyes may be applied prior to developing the azo colour.  The process is applicable to cotton, animal and synthetic fibres, e.g. cellulose acetate, viscose, wool and silk.  In example (1) cotton material is printed with a paste containing the diazoimino compound from diazotized 4-chloro-2-toluidine and methylglucamine, the o-toluidide of 2 : 3-oxynaphthoic acid, glycol monoethyl ether, caustic soda, starch-tragacanth thickener and sodium monochloroacetate, dried and steamed for five minutes, rinsed, soaped, rinsed and dried.  In examples (2)--(12) which are similar to (1), the following components are specified: the diazoimino compound from diazotized 4-chloro-2-toluidine, pine oil, a -monochlorhydrin, ammonium oxalate, triethanolamine lactate or hydrochloride, hydrochloric acid and triethanolamine, acetamide, the diazoimino compound from diazotized m-chloroaniline and methyl-glucamine, the diazoimino compound from diazotized 4-chloro-2-toluidine and pipecolinic acid, the m-4-xylidide of 2 : 3-oxynaphthoic acid, p-sulphobenzyl chloride; in some cases the glycol monoethyl ether may be omitted.  In examples (13) the following compositions are printed with a two-roll printing machine on cotton material and the colours developed by steaming and oxidizing: azo composition:--the diazoimino compound from diazotized 4-chloro-2-toluidine and pipecolinic acid, the m-4-xylidide of 2 : 3-oxynaphthoic acid, caustic soda, starch-tragacanth and sodium monochloracetate: vat dye composition:--Ponsol Blue GD Double Paste, starchgum thickener, potassium carbonate, sodium sulphoxylate formaldehyde, glycerine and water, (14) cotton material is printed as in (13) using a similar azo composition containing the diazoimino compound from diazotized 4-chloro-2-toluidine and methylglucamine and the o-toluidide of 2 : 3-oxynaphthoic acid and a vat composition containing Durindone 4B Double Paste, starch-gum-glycerine thickener, caustic soda and glucose.  The following compounds are also specified as developing agents: (1) alkali metal salts of halogenated aliphatic acids, e.g. a -b - dibromopropionic, dichloracetic, ethylchlorsuccinic and chlorsuccinic acids; (2) esters of mono- and polyhydric alcohols, e.g. mono-, di- and triacetin, ethyllactate, ethylene chlorhydrin; (3) acid amides, e.g. formamide; (4) salts of weak bases, e.g. triethanolamine acetate, formate, oxalate, sulphate and nitrate; (5) sulphoalkyl chlorides.  Ice - colour coupling components specified are arylides of 2 : 3-oxynaphthoic, hydroxyanthracene and hydroxyphenanthrene carboxylic acids, bisacetoacetyltolidine, &c., a -and b -naphthol and pyrazolones.  The Specification as open to inspection under Sect. 91 comprises also the use of ethyl chlorolactate as a developing agent and mentions "carbitol" as a solvent.  This subject-matter does not appear in the Specification as accepted.